Fokced-dfiaft device



G. NI. TAGGART.

FORCED DRAFT DEVICE.

APPLICATION FILED FEB. I7. Isls.

Patented Nov. 18, 1919.

.c orarioD GEORGIE M. TAGGART, 0F PHLADELPl-SIIA., PENNSYLVANIA., ASSIGNOR 0F ONE-HALF T0 SILAS H. TERRES, OF PHTLAIDELPT'IIA, PENNSYLVANIA.

Speciication of Letters Patent.

Patented N ov. 18, 1919.

s Application led February 17, 1919. Serial No. 277,405.

To all fro/tom it may concern.' i

Be it known that ll, Geenen M. TAccArJr, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State o1 Pennsylvania, have invented certain new and useful Improvements in Forced-Draft Devices, of which the following is a specification.

@ne object of my invention is to provide an improved forced draft device which will be well adapted for use on locomotives.

Another object is to so construct my invention that it will include an equalizing chamber into which exhaust steam is intermittently discharged and pipes tor conducting the steam after entering said equalizing chamber to produce a forced dratt.

Another object is to make my invention of a simple and durable construction and so that it can be quickly and easily assembled.

These objects and other advantageous ends which will be described hereinafter, I attain in theI following manner, reference being had to the accompanying drawings in which- Figure 1 represents a transverse sectional elevation through a boiler casing ot a locomotive and also showing my invention attached thereto; part ot my invention being shown in outside view and another part in section.

Fig. 2 is an enlarged sectional plan view taken on the line 2-2 of Fig. 1, and

Fig. 3 is an enlarged sectional elevation of certain of the parts of my invention.

Referring to the drawings and particularly to Fig. 1, 4 represents a boiler casing which provides a compartment 5 through which the products of combustion pass into the smoke stack 6. A hollow standard 7 is positioned in the bottom of the compartment 5 and into the standard the exhaust steam from the locomotive cylinders is injected. The means for conveying this exhaust steam, as illustrated, consists of two pipes 8 and 9 which extend respectively to the piston cylinders (not illustrated). llt will be understood, however, that owing to the well known action of a locomotive., the exhaust takes place alternately through the pipes 3 and 9.

The exhaust steam after passing into the hollow standard or nozzle 7 enters a chamber 10 which is provided by a cylindrical box 11. Two pipes 12 and 13 lead out ot the box 11 and upwardly through the boiler casing 4, said pipes separating as they extend upwardly.

The smoke stack 6 includes afhood 14 having two sides 15 and 16 which are inclined toward each other and two sides 17 and 18 which are arranged parallel to each other. The bottom plate 19 ot the hood 14 is rectangular and is `connected to the sides or walls 17 and 1S. This plate 19 has a central opening 20 therein and two side openings 21 and 22. Two plates 23 and 24 are pivoted at their bottom edges to the bottom 19 of the hood. The upper portions of the plates are tree to swing from the full line positions shown in Fig. 1 to the dot-and dash line positions.

AThe `pipes 12 and 13 enter the hood 14 through the openings 21 and 22. These pipes have hollow substantially T-shape heads 25 which lit against the inner surfaces of the sides 15 and 16 of the hood. Each of the heads 25 has a surface 26 against which the upper end portions of the plates 23 and 24 are adapted to abut. The heads 25, as clearly shown in Fig. 2, extend across the entire width of the hood 14 and it is obvious that when the plates 23 and 24 are in contact with the surfaces 26 of the heads 25 it is impossible for any air to enter the upper portion 27 of the smoke stack through the openings 21 and 22. The heads 25 have slots 28 which communicate with the interior of the hood 15 above the top edges of the plates 23 and 24. These slots 28 extend at an angle upwardly in their cross section, as shown in Fig. 1, so that steam will pass out of said slots into the portion 27 of the smoke stack 6; the direction of entrance of said steam being at inclines in opposite directions and also transversely of the height of said smoke stack.

The plates 23 and 24 can be moved by means of a rod 30 a portion of which extends `into the hood 14 and through a guide 31.

The lower end of the rod 30 is pivotally connected to two links 32 and 33. These links are, in turn, respectively pivoted to the plates 23 and 24. Thus by raising and lowering the rod 30, the plates 23 and 24 will be swung toward and Jfrom the surfaces 26 of the heads 25. It will thus be seen that when the plates 23 and 24 are moved toward each other, they will tend to cut off the passage of the products of comb-ustion through the opening 20 and at the same time air is free to enter, the portion 2i' of the smokestack' 6 through the openings 2l and 22.

By providing the chamber l0, the exhaust steam will be fed in equal parts to the pipes 12 and '13 and a steady flow of said steam is thereby secured. Furthermore, by delivering the exhaust steaminto the stack 6, as above described, and at substantially equal pressure, direct suction is produced to accelerate the movement of the products of combustion through the boiler and when the plates 23 and 24 are moved away from the heads 25, a suetion of air will be induced.

VIn constructing` the device of my invention, I preferably 'make the opening 34 of the nozzle 7 similar in cross sectional area to the combined cross sectional areas of the pipes 12 and 13 so that there will be a free passage of the steam from the chamber 10'.

Vhile I have described my invention as taking a particular form, it will be understood that the various parts of my invention may be changed without departing from the spirit thereof, and hence I do not limit myself to the precise construction set forth, but consider that am at liberty to makeY such changes and alterations as fairly come within the scope of the appended claims.

Having thus described my invention, what claim as new and desire to secure by Letters Patent is: Y

l. A device of the character described including a smoke stack having a hood provided with openings; means providing a chamber intoY which exhaust steam is intermittently injected; and pipes leading from said equalizing chamber into said smoke stack and having perforated heads, the perforations being located above the openings in said hood whereby the steam from the equalizing chamber enters said stack above said openings; substantially as described.

2. A device of the character described including a smoke stack having a hood, said hood including a bottom providing an opening for products of combustion into said smoke stack, said hood having other openings located at the sides of said lirst opening; steam pipes entering said hood and having hollow heads provided with slots` through which steam passes and enters the smoke stack g, plates movably mounted between said irst opening and said latter openings; said plates being movable into engagement with said heads below the slots thereof; substantially as described.

3. A device of the character described including a smoke stack having a hood, said hood including a bottom providing an open ing for products of combustion into said smoke stack, said hood having other openings located at the sides of said first opening; steam pipes entering said hood and having hollow heads provided with slots` through which steam passes and enters the smoke stack; and plates movably mounted between said first opening and said latter openings, said plates being movable into engagement with said heads below the slots thereof, said slots in cross section extending at an incline to each other for directing steam at an incline transversely to the height of the smoke stack; substantially as described.

In testimony whereof I havesigned my name to this specification in the presence of two subscribing witnesses.

GEORGE M. TAGGART.

Witnesses:

MARY A. INGLAR, CHAs. E. Po'r'rs. 

